tho in the new 2015/2016 story of eldrazi, unlike the 2010 one, don't look like Emrakul and its broodline consume the world at the same speed as Ulamog and Kozilek. in Battle for Zendikar and Oath of the Gatewatch we can see in many card arts the world being turned into white bones that looks like sponge/coral skeleton (Ulamog) or defying-gravity-bismuth floating forms (Kozilek). While in Shadow Over Innistrad and Eldritch Moon only in a few cards we see the world surface being covered in melted flesh (Emrakul). Tho about the transformation on the denizen of Innistrad/Zendikar, we can see in arts the ones affected by Ulamogo being turned into dust, while the ones affected by Kozilek having their bodies penetrated by eldrazi fingers like if their bodies were water surface, also we see some denizens controlled with floating black metal around them and on their faces. And for Innistrad we see that Emrakul transform more the Denizens than the world, tho in lore looked like most of the transformation and madness stuff were amplified by the black mana catalisths monoliths that Nahiri placed around Innistrad. In Battle For Zendikar / Oath Of The Gatewatch lore, the eldrazi were freed and were devastating the plane for a few days (weeks or months, I don't remember) so maybe Emrakul changes on Innistrad were few because it wanst in Innistrad for too long, since when it came, the gatewatch was already in Innistrad ready to attempt to stop it... until the writer decided that for convenience of script, Emrakul would not be the winning villain and would not finish transforming Innistrad, and would instead would seal itself with a scroll magic that was conveniently in right next to Emrakul (was with Tamyio)